In the installation guide on the AO product page, you might have missed the line where it says that you need a separate Ducting Kit (not supplied - consists of a tube and carbon filter that runs from the bottom to the top of the pipe). I missed this when I bought the product, and a few months later I noticed that there were dirty brown marks on the wall and ceiling at the top of the pipe. Thinking there was a fault, I called Samsung, they sent an engineer, but he didn't know what the problem was. He called two colleagues, one had heard of the ducting kit but never seen one and didn't know the part number. I called Samsung again, they couldn't identify the part, so put me onto 4mysamsung,co.uk who are their licensed parts dealer. Guess what, they couldn't identify the part either. So I am now left with an expensive item that does not work properly, was missing a critical part, and if I ever find a part number, is going to cost me to buy it, and get it installed. So in short, buy something else.